Configmap volume
A ConfigMap volume is a read-only Kubernetes volume that exposes ConfigMap data to containers as mounted files.
Kubernetes in Action, Second Edition
A ConfigMap volume is a Kubernetes volume that exposes data from a ConfigMap as files mounted in a container.
- How it is used
- Exposes large or multiline application configuration as container files instead of environment variables.
- How deep it goes
- Explains manifests, selected entries, hidden directory contents, subPath, missing references, and atomic symbolic-link updates.
- Examples
- Uses an Envoy configuration pod, mounted envoy.yaml and status-message files, selected items, and kubectl inspection commands.
- What you can do after
- Operate/configure pods with mounted ConfigMap files and diagnose startup, masking, selection, and update behavior.
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Kubernetes for Developers
A ConfigMap volume is a read-only Kubernetes volume that exposes ConfigMap data to containers as files.
- How it is used
- Provides application configuration files without extending the container image.
- How deep it goes
- Defines the volume’s purpose, contents, and read-only behavior, but defers manifest syntax and mounting steps.
- Examples
- Uses MariaDB, Apache, and Redis configuration files as examples of data mounted through ConfigMap volumes.
- What you can do after
- Apply it to supply configuration to an existing public container image without building a custom image.
Read how Kubernetes for Developers explains configmap volume →
Related concepts
- symbolic linkuses · A symbolic link is a filesystem object that refers to another filesystem path rather than containing the referenced file or directory's contents.
- configmapuses · A ConfigMap is a Kubernetes API resource that stores non-confidential configuration data as key-value pairs for use by workloads and other cluster components.
- volumekind of · A volume is a logical storage resource that provides capacity for storing and accessing data, often by making it available to an operating system or application.
- file systemuses · A file system is a software-managed structure and interface for organizing, naming, storing, and accessing files and directories on storage.
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